This is the 2075th most frequent Japanese word.
北門
"北門" means "North Gate."
Here, '北門' indicates a specific landmark (north gate) used to describe the location of the library in proximity to it.
図書館は北門の近くにあります。
The library is near the north gate.
In this example, '北門' refers to a physical gate on the north side and is being discussed in the context of its closure.
北門を閉めてください。
Please close the north gate.
In this sentence, '北門' is used to denote a specific entrance (north gate) to a location (campus).